decentraland / marketplace / 27019595603

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fix: gate cross-chain MANA buy on the route source chain (#2646)

When paying for a Polygon asset with MANA bridged from another chain, the
main action button fell through to renderBuyNowButton() with no network
check. If the wallet was still on the destination chain (e.g. Polygon)
instead of the route's source chain (e.g. Ethereum), the buy proceeded and
the cross-chain SDK queried the source MANA token's balanceOf on the wrong
chain — where that token has no code — reverting with a cryptic
"could not decode result data (value=0x, method balanceOf)" error.

Gate this branch on selectedChain === wallet.chainId, mirroring the existing
non-MANA branch: render the switch-network button when the wallet is on the
wrong chain so the user moves to the source chain before buying.

Adds a regression test covering a Polygon wearable paid with MANA sourced
from Ethereum while the wallet is still connected to Polygon.

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